Example of a standard electrical circuit
A: On the diagrams, the color of the wire is indicated by a letter code (see picture):
| Code | Color | Code | Color |
| IN | black | ABOUT | orange |
| BR | brown | R | pink |
| G | green | R | red |
| GR | grey | V | violet |
| L | blue | W | white |
| LG | light green | Y | yellow |
Note: for two-letter code (for example: RG) the first letter indicates the main color of the wire (red), and the second indicates the color of the stripe on the wire (green).
B: Indicates the connector that connects to this element (the number indicates the connector terminal number).
C: Indicates the terminal number of the connector. The numbering system is different for the socket and plug parts of the connector.
- The contacts in the female part of the connector are numbered from the upper left to the lower right edge.
- The contacts in the plug portion of the connector are numbered from the top right to the bottom left.
Note: When multiple connectors are used in one node, the names of each connector are indicated (letter of the alphabet) and the contact number. The numbering system for the general wiring diagram is the same as above.
D: Indicates the relay box. No tinting is applied, only the relay box number is shown to differentiate it from the block junction box.
Example:
indicates relay block #1.
E: Indicates the distribution block (the number in the circle indicates the distribution block number, and the connector code is indicated next to it).
F: Indicates a system that has a connection with the system in question.
G: Indicates the wire harness and wire harness connector.
- The wiring harness with a plug-in terminal is indicated by arrows (
).
- The numbers on the outside correspond to the connector terminal numbers.
- All connectors are shown with the opening side so that the lock is on top.
H: () are used to indicate different wires and connectors, for example, in relation to the car model, engine type or technical specifications.
I: Indicates shielded wiring harness see figure.
J: Indicates the grounding point.
| Code | Location |
| EA | on the right front fender |
| EV | on the left front fender |
| EU | on the engine block |
| ED | left front of radiator |
| IE | on the left protective panel |
| IF | on the right protective panel |
| IG | under the left protective panel |
| VN | inside, on the lower rear panel |
Connectors
The connectors are divided into groups according to their location on the vehicle and have a two-letter designation. The first letter indicates the group to which the connector belongs.
| Group | Location |
| E | engine compartment |
| I | dashboard area |
| IN | body |
The material is reprinted from an online resource [toyotaman]
When disconnecting connectors, do not pull on the wires and be careful when disconnecting the retaining clips.
1 - Squeeze, 2 - Press.